Well videos take a second to decode and appear which is why you see the white.

The white is just the Page Background image which you can change to be whatever you want in the Page's properties. So if you set that to be pure black or to be the first frame of your movie it should make it more seamless.

I am not sure what happened. Before tonight, if I hadn't loaded a 768x1024 page image fir a page, my background would be white. But, tonight, all of a sudden, it has become black. When I am in the behind the scenes of Composer, everything is white, but when I hit preview, the background goes black. I can't figure out what to do to get the background back to white?

Also, before this event happened, the behind the scenes desktop was blue around the page, now my entire desktop is white and there is a huge audio icon over the entire page. I attached two pics to show you what I mean.

This is Graphics corruption, I was never able to find all of the cases. They are very tricky to reproduce them on demand. Basically the memory that contains the pictures gets confused and images get drawn over images. So the blue background texture got drawn over by the white texture and you can just make out the grey image of the audio icon which in turn got drawn over the white image. This is only temporary as its in the iPads RAM only. Restarting Composer fixes it.